#include <stdio.h>

int main()
{
    char c;
    int letters = 0 ,space = 0,digit = 0,others = 0;
    printf("please input some characters\n");
    while((c=getchar())!='\n')
    {
        if(c>='a' && c<='z' || c>='A' && c<='Z')
        letters++;
        else if(c==' ')
        space++;
        else if(c>='0' && c<='9')
        digit++;
        else others++;
    }
    printf("all in al:char=%d space=%d digit=%d others=%d\n",letters,space,digit,others);
}